Inductance coil for high-frequency circuits



Nov. 8, 1927. 1,64&5&8 a. An Jov INDUCTANCE COIL FOR HIGH FREQUENCY CIRCUITS Filgd has. 1925 Patented Nov. 8, 1927,

oar-ran STATES GUY A. JOY, OF LOMBARD, ILLINOIS, ASSIGNOR T JOY-KELSEY tenses PATENT caries.

Application filed August 3, 1925. Serial No. 47,815.

This invention relates to electrical coils or windings and to the method of forming the same, and especially to such coils adapted for use in radio receiving circuits, though not necessarily limited thereto.

The main objects of the invention are to provide an improved form of inductance member or coil, especially for use in radio sets; to provide such a coilv having selfshielding, nonpickup properties, that is to say, being substantially proof against local interference; to provide such a coil having parts which are disposed laterally of the main effective portion, but all beingdisposed and arranged so as to maintain, throughout the entire winding, a sufficiently low potential difierence between adjacent turns so as to avoid appreciable leakage; and to provide an improved form of biaxial winding.

An illustrative embodiment of this invention is shown by the accompanying drawings, in which I s Fig. 1 is a conventional diagram of a radio receivin circuit including my improved form of coil.

Fig. 2 is a diagram of the coil elements or windings pulled out somewhat or elongated so as to show the relation of successive turns or coil elements.

Fig. 3 is an end View of the coil.

Fig. 4 is a side view of the coil.

In the construction shown in the drawings, the coil 1 asa whole comprises substantially a series of winding units A, B, C,

I numerous tangential cross members 10 serve etc, formed in coil pairs arranged in aline- Inent respectively on parallel axes and all.

, connected together in series. Each of the bihelical sections or units A, etc. includes a pair of flat coil members 2 and 3 arranged side by side in substantially the same plane,

or coplanar, but wound in mutually opposite directions. The coil elements 2 constitute one compound helix 4 and the other elements 3 constitute another compound helix 5. That is, the coil 1 is wound substantially in the form of a figure eight, as shown in Fig. 3 and Fig. 4, with two or turns made in each loop, or on each axis and the wire then, passed diagonally across to the opposite loo Referring to Fig. 1, the coil 1 is shown with one compound helix 4 arranged in inductive relation to the primary coil 6, which is in series with the antenna 7 and ground 8, the other compound helix 5 serving merely shown, but as will be more than two more complete as a balancing member or shield with respect to the inductively effective part 4.

In order that the coil parts may keep their due structural relation, supporting means or fasteners 9 are supplied, two for each loop of the winding as shown best in Fig. 3.

The method of winding this coil is to provide 'two temporary winding cores, not understood, spaced a fewinches apart in parallel relation, then starting at one core, wind on a certain number of turns, and thenrunning across tangentially, as at 10, Wind on the other core a like number of turns in the opposite di .rection; and so on back and forth until the coil is finished. I at a time, 3 consists prefer to apply two turns that is to say, each coil part 2 and of two complete turns, though turns might be so applied. The successive coil parts 2 are disposed close together side by side, and the same is true of the parts 3.

The self inductance of the coil asa whole is thus minimized, the numerous small successive units being mutually neutralized, so that one part of the coil can have little or no disturbing effect on another part.

The strips 9 are laid against the core before the windings are applied, and when the coil is finished the strlp ends are folded around and stuck together. A cement may well'be used to protect the coil and help to keep its shape, as will be understood. The

to render the coil most substantial and rigid.

It should be noted that with this construcstantially a small coil and that successive elements 2 and successive elements 3 respectively in the sections A, B, C, etc. are subject to only very slight differences in potential, as they are arranged side by side and allare connected in series.

Thepart 4 acts as a secondary for the primary 6 and any tendency for either part 4 or 5 to pick up noise or other interference is neutralized by the complementary part 5 or 4 respectively.

Tests have shown this coil to be more selective and more exclusive than any other coils with which I am acquainted.

Although but one embodiment of this invention is herein shown and described, it is to be understood that some'of-the details of CORPORATION, OF CHICAGO, ILLINOIS, A GOBPORATION OF ILLINOIS.

the construction. shown may be altered or omitted Without departing from the spirit of this invention as defined by the following claims.

I claim:

1. In a radio transformer, a primary coil and a secondary coil wound on two paraliei axes with the turns of the windings in series, said primary coil in close inductive relation with only the portion ofthe coil on one of the two axes.

2. In a radio transformer, a primary coil, and a secondary coil wound on tWo parallel axes with small groups of turns on one axis in series and wound oppositely to adjacent small groups of turns on the other axis, said primary coii arranged in inductive relation masses to only the portion of the secondary coil on one of the two axes.

3. Ina radio transformer, a primary coil, and a secondary coil wound with the turns alternately from one to another of two parallel loops and wound in opposite directions with two or more complete turns made in each loop and then the wire passed back to the other loop, said: primary coil arranged in inductive relation to only one of the loop I portions of the secondary coil.

4. A. radio coil having windings on two parallel axes with the wlre wound 1n two or more complete turns on one axis and then passed diagonally across and Wound oppositely on the other axis.

GUY A. J 0Y0 

